JUBININI 51 



slightly longer than fifth ; sixth very large. Medianly the stemites are flattened, 

 this flattening becoming more pronounced apically, and culminating on the fifth 

 and sixth stemites. Fifth stemite short medianly, and deeply incised to contain 

 the base of sixth; median posterior margin of fifth slightly produced, and with 

 two transversely ovate foveoid depressions. Sixth stemite broadly and entirely 

 concave, about four times as long as fifth. 



Prosternum long before the coxae, obtusely longitudinally carinate in the 

 anterior half. Anterior coxal cavities sharply defined. Mesostemum produced 

 between middle coxae in a long spinoid process; middle coxae subcontiguous. 

 Metasternum with a strong, longitudinal, median carina; the metasternum is 

 long. 



Anterior legs with the coxae prominently conical, the femora strongly in- 

 flated. Intermediate legs with the coxae much shorter, conico-ovoidal, femora 

 less strongly inflated. Posterior legs with coxae conical, each trochanter armed 

 with a very slender, translucent, aciculate spine which arises from the mesio- 

 basal angle. Tarsi long, slender; segments of equal diameter; first tarsomere 

 short, second and third tarsomeres very long, the third ending in two unequal 

 claws. Above description of male holotype. 



Female Allotype. Resembling the male holotype save for the following 

 secondary sexual differences: Eyes much smaller than in the male, consisting 

 of six coarse facets. These facets are arranged four in a ventral row and two in 

 a dorsal row. Stemites unmodified, convex. Second stemite long, longer than 

 first in the ratio of 2i/^ to l^^, and longer than the third in the ratio of 2i/^ to 1%. 

 Third stemite longer than fourth in the ratio of 1 to 0.8; fifth and sixth stemites 

 medianly of same length, simple; the sixth stemite sharply, semicircularly in- 

 cised in median third of hind margin. Femora moderately inflated but the pos- 

 terior trochanters are wholly simple and unarmed. Metasternum much shorter 

 than in the male, in the ratio of 2.8 for holotype metasternal length to 2 for 

 allotype metastemal length. 



Described from six specimens, all collected by Dr. E. C. Williams, Jr. in 

 the floor mold of the rain forest on Barro Colorado Island, Gatun Lake, Panama 

 Canal Zone, as follows: Holotype male and paratype male in mold sample 

 No. 1118 on July 17, 1938. Allotype female in mold sample No. 1034 on July 19, 

 1938. Paratype female in mold sample No. 34 on July 24, 1938. Paratype male 

 in mold sample No. 103 on July 24, 1938. Paratype female in mold sample 

 No. 345 on July 29, 1938. 



Jubus terranus is a member of Group IV, since I interpret this group as 

 having the vertexal foveae minute rather than absent, and hence the vertexal 

 foveae in Group IV are small, of the same diameter as the vertexal sulci, whereas 

 in Groups VI and VII they are conspicuously larger than the associated vertexal 

 foveae. Such an interpretation of Raffray's group key (I.e.) is entirely con- 

 sistent with the anatomy of the genus, and takes into account the less powerful 

 and less illuminated equipment of earlier days. If such an interpretation is not 

 made, then the suggestion arises that there are no vertexal foveae, or that such 

 foveae are not in any way associated with their vertexal sulci, and this view is 



